Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Financial assets:
Debt Securities, Available-for-sale	$ 3,546,006,000
Short term investments	430,331,000	$ 557,270,000
Other Investments	391,217,000	431,630,000
Derivative assets	59,768,000	73,826,000
Other assets	4,516,000	5,979,000
Financial liabilities:
Derivative liabilities	76,999,000	83,409,000
Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	2,737,286,000	2,914,145,000
Loans at Carrying Amount	4,287,664,000	11,529,384,000
Derivative assets	66,302,000	54,877,000
Financial liabilities:
Derivative liabilities	1,712,062,000	2,205,264,000
Short-term Investments [Member]
Financial assets:
Debt Securities, Available-for-sale	430,331,000	557,270,000
Available-for-sale Securities	430,331,000
Corporate Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	2,737,286,000	2,914,145,000
Carrying Amount [Member]
Financial assets:
Loans	9,913,000	10,358,000
Other assets	4,516,000	5,979,000
Total financial assets	11,185,865,000	20,953,414,000
Financial liabilities:
Liabilities for net financial guarantees written	(718,388,000)	3,435,438,000
Long-term debt	3,304,737,000	1,428,680,000
Total financial liabilities	9,643,706,000	19,312,708,000
Carrying Amount [Member] \| Variable Interest Entity [Member]
Financial assets:
Restricted cash	999,000	978,000
Loans at Carrying Amount	4,287,664,000	11,529,384,000
Financial liabilities:
Long-term debt	5,268,596,000	12,160,544,000
Carrying Amount [Member] \| Other Debt Obligations [Member]
Financial assets:
Other Investments	391,217,000	431,630,000
Carrying Amount [Member] \| Short-term Investments [Member]
Financial assets:
Short term investments	430,331,000	557,270,000
Carrying Amount [Member] \| Other Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	1,459,000	566,000
Carrying Amount [Member] \| Corporate Debt Securities [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	2,737,286,000	2,914,145,000
Carrying Amount [Member] \| Interest Rate Swaps [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position		627,000
Derivative liabilities	71,861,000	81,495,000
Carrying Amount [Member] \| Interest Rate Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	1,712,062,000	2,205,264,000
Carrying Amount [Member] \| Futures Contracts [Member]
Financial liabilities:
Derivative liabilities	3,379,000	1,348,000
Other Assets [Member] \| Carrying Amount [Member] \| Interest Rate Swaps [Member]
Financial assets:
Derivative assets	59,468,000	73,199,000
Interest Rate Swaps - Liability Position [Member] \| Carrying Amount [Member] \| Currency Swaps [Member] \| Variable Interest Entity [Member]
Financial assets:
Derivative assets	66,302,000	54,877,000
Fair Value Measured at Net Asset Value Per Share [Member]
Financial assets:
Other Investments	279,941,000	310,441,000
Level 1 [Member]
Financial assets:
Total financial assets	553,964,000	1,273,040,000
Financial liabilities:
Liabilities for net financial guarantees written	0	0
Long-term debt	0	0
Total financial liabilities	3,379,000	1,348,000
Level 1 [Member] \| Variable Interest Entity [Member]
Financial assets:
Restricted cash	999,000	978,000
Loans	0	0
Financial liabilities:
Long-term debt	0	0
Level 1 [Member] \| Other Debt Obligations [Member]
Financial assets:
Other Investments	71,108,000	56,498,000
Level 1 [Member] \| Short-term Investments [Member]
Financial assets:
Short term investments	304,880,000	389,299,000
Level 1 [Member] \| Equity Method Investments [Member]
Financial assets:
Other assets	0	0
Level 1 [Member] \| Other Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	0	0
Level 1 [Member] \| Corporate Debt Securities [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Level 1 [Member] \| Interest Rate Swaps [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position		0
Derivative liabilities	0	0
Level 1 [Member] \| Interest Rate Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	0	0
Level 1 [Member] \| Futures Contracts [Member]
Financial liabilities:
Derivative liabilities	3,379,000	1,348,000
Level 1 [Member] \| Loans Receivable [Member]
Financial assets:
Loans	0	0
Level 1 [Member] \| Other Assets [Member] \| Interest Rate Swaps [Member]
Financial assets:
Derivative assets	0	0
Level 1 [Member] \| Interest Rate Swaps - Liability Position [Member] \| Currency Swaps [Member] \| Variable Interest Entity [Member]
Financial assets:
Derivative assets	0	0
Level 2 [Member]
Financial assets:
Total financial assets	3,152,882,000	4,005,195,000
Financial liabilities:
Liabilities for net financial guarantees written	0	0
Long-term debt	2,909,272,000	1,046,511,000
Total financial liabilities	9,744,699,000	12,735,499,000
Level 2 [Member] \| Variable Interest Entity [Member]
Financial assets:
Restricted cash	0	0
Loans	0	0
Financial liabilities:
Long-term debt	5,051,504,000	9,402,856,000
Level 2 [Member] \| Other Debt Obligations [Member]
Financial assets:
Other Investments	0	29,750,000
Level 2 [Member] \| Short-term Investments [Member]
Financial assets:
Short term investments	125,451,000	167,971,000
Level 2 [Member] \| Equity Method Investments [Member]
Financial assets:
Other assets	0	0
Level 2 [Member] \| Other Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	0	0
Level 2 [Member] \| Corporate Debt Securities [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Level 2 [Member] \| Interest Rate Swaps [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position		627,000
Derivative liabilities	71,861,000	81,495,000
Level 2 [Member] \| Interest Rate Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	1,712,062,000	2,205,264,000
Level 2 [Member] \| Futures Contracts [Member]
Financial liabilities:
Derivative liabilities	0	0
Level 2 [Member] \| Loans Receivable [Member]
Financial assets:
Loans	0	0
Level 2 [Member] \| Other Assets [Member] \| Interest Rate Swaps [Member]
Financial assets:
Derivative assets	12,008,000	11,825,000
Level 2 [Member] \| Interest Rate Swaps - Liability Position [Member] \| Currency Swaps [Member] \| Variable Interest Entity [Member]
Financial assets:
Derivative assets	66,302,000	54,877,000
Level 3 [Member]
Financial assets:
Total financial assets	7,176,883,000	15,347,011,000
Financial liabilities:
Liabilities for net financial guarantees written	558,824,000	4,842,402,000
Long-term debt	350,694,000	322,988,000
Total financial liabilities	1,128,069,000	7,923,644,000
Level 3 [Member] \| Variable Interest Entity [Member]
Financial assets:
Restricted cash	0	0
Loans	4,287,664,000	11,529,384,000
Financial liabilities:
Long-term debt	217,092,000	2,757,688,000
Level 3 [Member] \| Other Debt Obligations [Member]
Financial assets:
Other Investments	16,266,000	17,288,000
Level 3 [Member] \| Short-term Investments [Member]
Financial assets:
Short term investments	0	0
Level 3 [Member] \| Equity Method Investments [Member]
Financial assets:
Other assets	4,516,000	5,979,000
Level 3 [Member] \| Other Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	1,459,000	566,000
Level 3 [Member] \| Corporate Debt Securities [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	2,737,286,000	2,914,145,000
Level 3 [Member] \| Interest Rate Swaps [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position		0
Derivative liabilities	0	0
Level 3 [Member] \| Interest Rate Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	0	0
Level 3 [Member] \| Futures Contracts [Member]
Financial liabilities:
Derivative liabilities		0
Level 3 [Member] \| Loans Receivable [Member]
Financial assets:
Loans	11,620,000	10,284,000
Level 3 [Member] \| Other Assets [Member] \| Interest Rate Swaps [Member]
Financial assets:
Derivative assets	47,460,000	61,374,000
Level 3 [Member] \| Interest Rate Swaps - Liability Position [Member] \| Currency Swaps [Member] \| Variable Interest Entity [Member]
Financial assets:
Derivative assets	0	0
Ambac insured Re-remic [Member] \| Level 3 [Member]
Financial assets:
Available-for-sale Securities		26,067,000
Municipal Bonds [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	879,919,000	779,834,000
Corporate Debt Securities [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	1,278,122,000	860,075,000
Debt Security, Government, Non-US [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	30,834,000	26,543,000
US Government Debt Securities [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	94,394,000	85,408,000
Residential Mortgage-Backed Securities [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	258,607,000	2,251,333,000
Collateralized Debt Obligations [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	131,356,000	51,037,000
Asset-backed Securities [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	442,443,000	597,942,000
Cash and Cash Equivalents [Member] \| Carrying Amount [Member]
Financial assets:
Cash	82,494,000	623,703,000
Cash and Cash Equivalents [Member] \| Total Fair Value [Member]
Financial assets:
Cash	82,494,000	623,703,000
Cash and Cash Equivalents [Member] \| Level 1 [Member]
Financial assets:
Cash	52,661,000	615,073,000
Cash and Cash Equivalents [Member] \| Level 2 [Member]
Financial assets:
Cash	29,833,000	8,630,000
Cash and Cash Equivalents [Member] \| Level 3 [Member]
Financial assets:
Cash	0	0
Fair Value, Measurements, Recurring [Member]
Financial assets:
Total financial assets	11,163,670,000	20,935,687,000
Financial liabilities:
Liabilities for net financial guarantees written	558,824,000	4,842,402,000
Long-term debt	3,259,966,000	1,369,499,000
Total financial liabilities	10,876,147,000	20,660,491,000
Fair Value, Measurements, Recurring [Member] \| Variable Interest Entity [Member]
Financial assets:
Restricted cash	999,000	978,000
Loans	4,287,664,000	11,529,384,000
Financial liabilities:
Long-term debt	5,268,596,000	12,160,544,000
Fair Value, Measurements, Recurring [Member] \| Other Debt Obligations [Member]
Financial assets:
Other Investments	367,315,000	413,977,000
Fair Value, Measurements, Recurring [Member] \| Short-term Investments [Member]
Financial assets:
Short term investments	430,331,000	557,270,000
Fair Value, Measurements, Recurring [Member] \| Equity Method Investments [Member]
Financial assets:
Other assets	4,516,000	5,979,000
Fair Value, Measurements, Recurring [Member] \| Other Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	1,459,000	566,000
Fair Value, Measurements, Recurring [Member] \| Asset-backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	442,443,000	597,942,000
Fair Value, Measurements, Recurring [Member] \| Collateralized Debt Obligations [Member]
Financial assets:
Debt Securities, Available-for-sale	131,356,000	51,037,000
Fair Value, Measurements, Recurring [Member] \| Residential Mortgage-Backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	258,607,000	2,251,333,000
Fair Value, Measurements, Recurring [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	94,394,000	85,408,000
Fair Value, Measurements, Recurring [Member] \| Debt Security, Government, Non-US [Member]
Financial assets:
Debt Securities, Available-for-sale	30,834,000	26,543,000
Fair Value, Measurements, Recurring [Member] \| Corporate Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	1,278,122,000	860,075,000
Fair Value, Measurements, Recurring [Member] \| Corporate Debt Securities [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	2,737,286,000	2,914,145,000
Fair Value, Measurements, Recurring [Member] \| Municipal Bonds [Member]
Financial assets:
Debt Securities, Available-for-sale	879,919,000	779,834,000
Fair Value, Measurements, Recurring [Member] \| Interest Rate Swaps [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position		627,000
Derivative liabilities	71,861,000	81,495,000
Fair Value, Measurements, Recurring [Member] \| Interest Rate Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	1,712,062,000	2,205,264,000
Fair Value, Measurements, Recurring [Member] \| Futures Contracts [Member]
Financial liabilities:
Derivative liabilities	3,379,000	1,348,000
Fair Value, Measurements, Recurring [Member] \| Loans Receivable [Member]
Financial assets:
Loans	11,620,000	10,284,000
Fair Value, Measurements, Recurring [Member] \| Other Assets [Member] \| Interest Rate Swaps [Member]
Financial assets:
Derivative assets	59,468,000	73,199,000
Fair Value, Measurements, Recurring [Member] \| Interest Rate Swaps - Liability Position [Member] \| Currency Swaps [Member] \| Variable Interest Entity [Member]
Financial assets:
Derivative assets	66,302,000	54,877,000
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Asset-backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Collateralized Debt Obligations [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Residential Mortgage-Backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	94,394,000	85,408,000
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Debt Security, Government, Non-US [Member]
Financial assets:
Debt Securities, Available-for-sale	29,922,000	25,615,000
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Corporate Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	0	450,000
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| Municipal Bonds [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Asset-backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	370,372,000	525,402,000
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Collateralized Debt Obligations [Member]
Financial assets:
Debt Securities, Available-for-sale	131,356,000	51,037,000
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Residential Mortgage-Backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	258,607,000	1,515,316,000
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Debt Security, Government, Non-US [Member]
Financial assets:
Debt Securities, Available-for-sale	912,000	928,000
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Corporate Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	1,278,122,000	859,625,000
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| Municipal Bonds [Member]
Financial assets:
Debt Securities, Available-for-sale	879,919,000	779,834,000
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Asset-backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	72,071,000	72,540,000
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Collateralized Debt Obligations [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Residential Mortgage-Backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	0	736,017,000
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Debt Security, Government, Non-US [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Corporate Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Municipal Bonds [Member]
Financial assets:
Debt Securities, Available-for-sale	$ 0	0
Collateral Pledged [Member] \| US Government Debt Securities [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale		99,719,000
Collateral Pledged [Member] \| Fair Value, Measurements, Recurring [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale		99,719,000
Collateral Pledged [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale		99,719,000
Collateral Pledged [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale		0
Collateral Pledged [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale		$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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- Definition

Fair value portion of investments accounted under the equity method.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 323
-SubTopic 10
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=66022186&loc=d3e32014-111567

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- References

No definition available.

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No definition available.

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- Definition

Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services.

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-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12201-110248

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Fair value of financial and nonfinancial obligations.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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-SubTopic 210
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-Paragraph 1
-Subparagraph (SX 210.9-03.7(a))
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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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No definition available.

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Amount of investments classified as other.

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Amount of short-term investments classified as other.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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